Resilient tire



4 PU Eur. .7 .7` A., .ly vE S .L U H a a ec. 1923. I

' RESILIEM TIRE vaginal Filedmaroh 22 1923 ATTORNEY. v

CSI

etented Een., i8, m23.

EDISON G. HULSE, GIF CUMBERLAND, MARYLAND, ASSGNGR T0 KELLY-SPRINGFIELDTIE COMPANY, CUMBEBLAND, MABYLANI, .A CORPORATION 0F NEW JERSEY.

RESILIENT TIRE.

- @riginal application sied Haren 22, 1923, Serial owll. Divided andthis appiction led April 26,

1923. Serial No. 634,744.

To. all whom t may concern.'

Be it known that I, Emisor: Gr. HULsE, e

citizen of the United States, ,residing nt larly describes und claimscertain novel lezi-v tures illustrated!1 generally, in the prior cose.

' The present invention relates, speciticall to the type of resilientlvehicle tire mainly dependent for resiliency upon the' presence ofstress-rellering,r voids active within. that portion of the structuresubject to strains of great intensity set up Within the zone o'traction. Among the several udvuntuges und objectives attained by mynovel construction, the following are the more prominent:

The attainment, of e high degree of ref siliency by theprovision of enovel type of internal void which does not materially weaken thestructure.

The provision of internal voidsintended toy provide al vsrieble degreeof resiliency, dellnitely related tothe increment of iced on the tire,whereby, in the presence of rel- Iaitively moderate loedingsthe tirewill he vinitially highly resilient, but vprogressively stillen andbecome morev resistent to disl tortion in the presence rof excessiveloads ci v without, however, losing the benefit of the presence of thatportion of the internal void which retains its integrity, overloaded.

The provision, in the novel design of the internal voids, of ineens'whereby rood accretions are expelled and the heat of internal frictionof the tire mess effectively dissipated. l

With these andother objects'in View, as more articularly emphasized inthe :follow ing iscussion and inV the drawings and claims, my inventionresides in the .novel means availed of in the composite tire strucn turechosen as e means for illustrating a, preferr-ed forni of rnyinvention.

' Figure 1 represents a cross section and partially executed perspectiveof s,4 tire embodyinr my novel improvements, it being noted that only somuch oi" tho'metliod'of working the peculiar internal voids, es necesysary to illustrate the basic thought, is indicated. v

Figure 2 shows a cross section'of the same structure illustrated in Fig.l., but under lond,uf'hereby the process of closing up of the portionsof the voids that impart the high degree oi initial resiliency isclearly manifest. Also the ultimate' resiliencyiin-V perting void,taking the form of s subsite-nfv tially continuous circumferential voidin the medien plane of the structure, is clearly shown.

Fig, 3 is n side view of :iv fragment of the tire, not loaded, showingthe staggered reletion of the voids which work their wey inwardly undtoward the tread in arcuate paths whereby their inner termini extendwithin the medien ploneV of the structure, thereby creat-ingrfi-substantially lcircumferential end continuous void in the seidmedian pleine.

ReferringV particularly to the drawings, numeral l() represents theiesilient tire muss, .preferably vulcanized in e, permanent menner Vupon'un annuler bese rim 11. The system of voids comprises a. plurality ofregularly spaced -aircuete openings, l seid openings preferably bein ofrectangular cross section and having t 'allonger exis of said crosssection disposed circumferentia-lly of the tire. These voids haveexternal oriyfices 12 originating close. tothe bese rim from whencetheir arcuate portions 13 sweep inwardly 4:ind upwardly toward the treadto terminate in an arch'cilect within the zone latin the medien plane ofthe tire structure and relatively close to the tread surface.

These arcuate voids are preferably fomnedv by introducing metallic coreswithin the soft,

--unvulcenized, structure priori to the moldingr operation-alternetelyfrom each side and these appliances are afterwards withdrnwn, leavingthe voids clear. ln view-0f` this preferred inethod of forming thevoids, it 1s usuel to provide a. sliglitclearence (see A Fig. 3)between/'the cores 4on alternate' sides of the tire,rl,nerely toobviafte the .}neces sity for prec/isifn Amold-ing. The lclearance A,ifInnintained, results in the isolation of each/void within the zone l4bycreating a. thinfilamjentery well of/ rubber, of e thick- ,ness A, atthis point.' This 'wall ma. of

bourse, he perforohd et will; y

The chiefpuposeof this novel void, or

parallel sides system of voidsD is apparent by reference to Fig 2,wherein the tire is shown under considerable lood. lVlien the tire isnominally loaded the elongated orifices i2 will he but slightlyeonstrieted and will serre .ae o., primary or initial means forirnjiarting resiliency. Under normal loadings, these openingen/ill actesconstantly Vibrating Spring members, normally open and actively res-`ponsive te taire np casual road. shocks as the rebounding subsurfacemateriel flows into them. As the tireis overloaded, these oriliresprogressively close as do the outwardly directed arcuate portions i3 ol'the voids, but the centr-el void 1l hes the inherent prop erty of alweysremaining open with' atten` nated portions ot the void i3; time,regard.- less of the closing ot' portions l2, under snflm den shock, ora Statie condition of overleed, the ultimate resiliency of the system ispreserved, as explained. ln other Words, even though the initial,lively, responsive, resilient properties may be lost with theconstriction ot' voids 12, yet the remaining extent ol; the

resiliency imparting system is uninipeired .As en additional advantageof venting the central void to the atmosphere, in the inannerdescribed," attention is called to the wellH known tendency et largetruck tires to generate intense und destructive internal heat. The heetof 'irietion thus generated will loe readily dissipated by the voids ofmy invero tion. ln fast5 the peculiar design oi 'features will canse airto be alternately 'sucked into and expelled from the voids,

due to the palpitation of the outer limits of the duct i3 as thosemembers become sneeessively exposed to the distortion of the mass withinthe area of rolling Contactn A further' advantage residing in thedirection chosen. for these duets 13 is that, any casual roadnceretions, or water, that may find entrance. within the central voidwhen. the linirticnhir receiving;- oriiioe is close to the road willpromptly roll out of the Seine orilice when the lire assumes adiii'erent stage oi rotnlion.

in thix selection ot a preferred cross seetional 'forni ot the tire toWorlr' to the best advantage in coordinate .relation with my noveliirnprm'enients, the trapezoidal type has been illustrated, with theshorter of the constituting the tread portion. In this trapezoidal typethe loaded nose portion of'the treed will resist mushroomingr and thesides will not bulge nn duly; thus offering superior inherentWeightbearing characteristics, end causing vthe loaded side walls vtolreact to best advantage' Liemeewtl'iin the zone oit influence oi theorilices lf2.

Having new described my invention, in

its preferred form, but without desiringto be limited to the preciseexample disclosei., what l claim is: f

l. A resilient tire having circumferentially extensive snh-tread voidsAvented `through the side Walls by ducts inclined toward thelbse havingerilices with major 'axes disposed circnin'ferentially of the Said tire.

5. A resilient tire having snb-tread voids rented through the side wallsby ducts arcnately inclined toward the base thereof.

(t A resilient tire heaving Sul'itread voids vented throughthe sideWalls by ducts renately inclined toward the base thereof, seiddnetshaving orifices with major axes disposed eircomierentially oi thesaid tire.

71 A resilient tire having sub-tread voids rented alternately throughthe opposed side wells by duets arcnately inclined toward the basethereof said duets lnivinfF erii'ices relef tively elose to the saidbase with finajor axes disposed .eirenrnterentiallw of the seid tire;

' S. Il. resilient tire ieving nnitormly spaced resiliency-impartingsnbftreed voids originating on alternating sides of the tire in orificesand converging toward thetread to termini relatively close thereto.

9. A resilient tire having resiliency-impart-ing; sub-trend voidsoriginating on altornate sides of the tire in orifices hai/ing theirmajor axes disposed oircumlierentially thereof and converging toward thetread to terminate in approximately the median plane of said tire.

10. A resilient tire having eireunilterem tielly extensiveresiliency-imparting Subtread voids originating alternately in ori-.tires near the tireV base in the opposed sidev walls, said' voidsbeing' arcliately inclined from said origin toward the tread. and terLminating reletiyelyelose thereto.

ln testimony whereof ll aille my signature.

nelson o. Horen.

lli)

